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Darius4522 · 12-05-2009, 11:18 PM

Anyone know anything about this lens, especially IQ? I'd appreciate feedback....

Zav · 12-06-2009, 12:32 AM

It sounds like one those cheap Cosina zoom with the Voigtlander brand. Nothing like the Cosina-Voigtlander SL primes.

Darius4522 · 12-06-2009, 03:37 PM

Yep. Your are right. Subsequently found a link, and it is a cheap plastic lens.

**Digitalis** · 12-08-2009, 11:36 PM

an apochromatic zoom lens that goes down to 28mm?

now,that's a novel idea. I was under the impression from lens manufacturers that it is impossible to incorporate apochromatics in lenses shorter than 100mm.

Ben_Edict · 12-09-2009, 02:15 PM

Originally posted by Digitalis

an apochromatic zoom lens that goes down to 28mm?

now,that's a novel idea. I was under the impression from lens manufacturers that it is impossible to incorporate apochromatics in lenses shorter than 100mm.

Well, may be. But you can hardly call a lens 28-200 (Apo only 100-200)? It is just, that an apochromatic design does not make much sense at short focal lengthes, as chromaticism only gets visible with longer focal lengthes.

Ben

**Digitalis** · 12-09-2009, 04:48 PM

then why, god why, didn't pentax make the DA*200mm f/2.8 apochromatic? - that lens has the most horrible -green/purple fringed bokeh of any lens I have EVER SEEN. Apochromatics would have gone a long way towards correcting that kind of chromatic error in the lens.

Ben_Edict · 12-10-2009, 01:25 AM

Originally posted by Digitalis

then why, god why, didn't pentax make the DA*200mm f/2.8 apochromatic? - that lens has the most horrible -green/purple fringed bokeh of any lens I have EVER SEEN. Apochromatics would have gone a long way towards correcting that kind of chromatic error in the lens.

200mm is commonly be seen as the limit, which necessitates APO design to suppress secondary colours. Why Pentax stuck to the old FA lens design is there secret. May be just economic thinking or pressures?

Ben

12-05-2009, 11:18 PM	#1
Darius4522 Inactive Account Join Date: Jan 2007 Location: Adelaide, Australia Photos: Gallery Posts: 155	Voigtländer APO Zoomar AF 28-210mm f4.2-6.5 ??? Anyone know anything about this lens, especially IQ? I'd appreciate feedback....

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12-06-2009, 12:32 AM	#2
Zav Pentaxian Join Date: Feb 2009 Photos: Gallery Posts: 1,371	It sounds like one those cheap Cosina zoom with the Voigtlander brand. Nothing like the Cosina-Voigtlander SL primes.

12-06-2009, 03:37 PM	#3
Darius4522 Inactive Account Join Date: Jan 2007 Location: Adelaide, Australia Photos: Gallery Posts: 155 Original Poster	Yep. Your are right. Subsequently found a link, and it is a cheap plastic lens.

12-08-2009, 11:36 PM	#4
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,695	an apochromatic zoom lens that goes down to 28mm? now,that's a novel idea. I was under the impression from lens manufacturers that it is impossible to incorporate apochromatics in lenses shorter than 100mm.

12-09-2009, 02:15 PM	#5
Ben_Edict Veteran Member Join Date: Jul 2007 Location: SouthWest "Regio" Photos: Albums Posts: 3,309	Originally posted by Digitalis an apochromatic zoom lens that goes down to 28mm? now,that's a novel idea. I was under the impression from lens manufacturers that it is impossible to incorporate apochromatics in lenses shorter than 100mm. Well, may be. But you can hardly call a lens 28-200 (Apo only 100-200)? It is just, that an apochromatic design does not make much sense at short focal lengthes, as chromaticism only gets visible with longer focal lengthes. Ben

12-09-2009, 04:48 PM	#6
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,695	then why, god why, didn't pentax make the DA200mm f/2.8 apochromatic? - that lens has the most horrible -green/purple fringed bokeh of any lens I have EVER SEEN*. Apochromatics would have gone a long way towards correcting that kind of chromatic error in the lens.

12-10-2009, 01:25 AM	#7
Ben_Edict Veteran Member Join Date: Jul 2007 Location: SouthWest "Regio" Photos: Albums Posts: 3,309	Originally posted by Digitalis then why, god why, didn't pentax make the DA200mm f/2.8 apochromatic? - that lens has the most horrible -green/purple fringed bokeh of any lens I have EVER SEEN*. Apochromatics would have gone a long way towards correcting that kind of chromatic error in the lens. 200mm is commonly be seen as the limit, which necessitates APO design to suppress secondary colours. Why Pentax stuck to the old FA lens design is there secret. May be just economic thinking or pressures? Ben

Voigtländer APO Zoomar AF 28-210mm f4.2-6.5 ???

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